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Finding the Fourth Proportional to 129,483.34, 178,690.35 and 72,896.74

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Solution

The fourth proportional to 129,483.34, 178,690.35 and 72,896.74 is: 100,599.38

Step by Step Solution

  1. Step 1: Write the proportion equation
    129,483.34 : 178,690.35 = 72,896.74 : x
  2. Step 2: Convert to fraction form
    129,483.34/178,690.35 = 72,896.74/x
  3. Step 3: Cross multiply
    129,483.34x = 178,690.35 × 72,896.74
  4. Step 4: Simplify right side
    129,483.34x = 13,025,943,984.46
  5. Step 5: Solve for x
    x = 13,025,943,984.46/129,483.34
  6. Step 6: Final answer
    x = 100,599.38

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1.5x scale

Why These Related Problems?

These problems maintain the same ratio (1.38) or explore similar proportional relationships. Practicing with related ratios helps build understanding of proportional relationships.